Grinding-mill



H. F. WINSLOW.

APPLICATION FILED .1ULY 24. 1920.

l Patented Nov. 8, 1921.

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GBINDIN G-M ILL.

Specification of Letters Patent.

Application led July 24, 1920. Serial No. 398,708.

To allwhomitmayconcerrn Be it known that I, HARRY F. VWINsLow, a citizen of the vUnited States, and resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Grinding- Mills, of which the following is a specification.

This invention relates to an attachment for grinding -mills of the type adapted for use in grindingviscous materials such as paints, inks, chocolates or the like, the invention havin particular reference to the distribution o the materialA on the surface of the grinding rolls.

Grinding m1lls of this type ordinarily comprise a succession of grinding rolls over which the material is carried, being drawn from one roll to the next succeeding one. In the ordinary operation of these mills the coarser particles of the material have a tendencyT to gradually work outwardly from the center to the opposite ends of the rolls, necessitating the removal or stripping of the material on the end portions of one of the later rolls of the sequence and the refeeding of such material to the mill, this refeeding being commonly done by han The present invention has for an object to automatically effect the collection of the coarser partlcles from the ends of the later roll and refeed the same to an earlier roll, while leavin the finely ground particles at the center o the roll to pass on to the discharge point.

More specifically, the invention has for an object to provide a simple and inexpensive device for the above purpose which may be easily attached tothe ordinary form of mill.

For further comprehension of the invention, and of the objects and advanta es thereof, reference will be had to the ollowing description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth. y

Figure 1 of the drawings is a longitudinal vertical sectional view of a grinding mill h provided with my improved attachment, this view being taken on the line 1-1 of Fig. 2.

Fig. 2 is a plan view of the mill.

Fig. 3 is a detail face view .of one of the refeeding devices.

Fig. 4 is a transverse section on the line 4 4 of Fig. 3.

In the drawings I have illustrated my attachment applied to an ordinary mill compr 1s1n the t ree grindin rolls, 1, 2 and 3 suitab y Journaled in si e frames 4. The roll 1 may be rotated by a suitable belt applied toa pulley 5 on one end of the roll shaft 1. This roll imparts rotation at an increased by means ofa gear 6 on the other end of its shaft l which meshes with a smaller gear 7 on the end of the shaft2 of the second roll 2. The third roll 3 is rotated at a still further increased speed by another gear 8 on the shaft 2 which meshes with a smaller gear 9 on the shaft 3 of the third roll. These parts as just described are of well known constructlon, the material to be ground being piled upon converging portions of the rolls 1 and 2 as indicated at 10. A pair of vertical plates 11 are located between the converglng portions of the rolls 1 and 2 adjacent Patented Nov. 8, 1921.

rate of speed to the second roll 5?/A the ends thereof to retain thematerial on the i rolls, these plates being here shown as fixed on the ends of pins 12 secured in apertured members on the side frames 4 by screws 14. A scraper 15 engages the roll 3 and removes the ground material which passes into alreceptacle 16. A

As here embodied my improved attachment comprises a pair of separated devices located above the meeting line of the rolls 2 and 3 toward opposite ends thereof. Each of these devices comprises a housing 18 which is of inverted U-shape as seen transversely of the mill ,and having the legs thereof, as viewed longitudinally of the mill, concavely curved on p osite sides as at 19 to fit the peripheries' o the rolls 2 and 3, these twocurved sides merging into a sharp point at the bottom so as to extend substantially down to the meeting line of the rolls.

To retain these housings in position a pair of.

rods 20 are .mounted in suitable eyes 21 on the side frames 4 in which they are detachably secured byset screws, 22, these rods aving sleeves 23 slidable thereon and secured thereto by set screws A24. Each of these sleeves 23 has projecting rigidly downward therefrom a screw 25E which passes freely through an aperture 26 in the top of the Vhousing 18, this screw having a nut 27 ioo l threaded thereon and adapted to bear downwardly on the top of the housing to force the curved sides of the latter with a desired degree of pressure against the rolls 2 and ,j Carried within each of the houslngs 181s a scraper plate which extends Substantially the full interior area thereof .and is preferably pivotally mounted thereln, being here Shown as provlded with hinge brackets 31 which engage a rod 32 exte nd ing between and supported by opposite sides or legs of the housings. To permit of vertical adjustment of the scraper 30 the hlnge brackets 31 are secured to the latter by headed screws 33 which pass through vertlcal Slots 34 in the scraper and are threaded into the hinge brackets. l n

The scraper plate is posltloned with the bottom, or scraping, edge thereof a Short distance above the meeting line of the rolls, which are moving upwardly at their 'adjacent sides toward the scraper as lndicated by the arrows. This bottom -edge of the scraper is yieldingly pressed against the rolls by a pair of expansion spr1ngs, such aS 35, which are coiled around a palr of headed Screw rods 36 passing freely through,

` and supported by, projections 37 on the housings, these rods having nuts 38 threaded on their other ends, the springs 35 bearlng between these nuts and the top of vthe scraper. To facilitate adjustment of .the nuts on the rods the nuts are held agalnst turning movement, while the screw rods 36 are rotatable, the nuts having pins 40 projecting therefrom into grooves such as 41 in the sides of the housings 18. To permlt `of the vertical adjustment, above referred to, of the Scraper, the top of the latter is vertically slotted toward opposite sides as at 42 to accommodate the rods 36 and has a central slot 43 to accommodate the screw 25.

In the operation of the mill with my improved attachment thereon the coarser par-- ticles of material which have worked toward the ends of the rolls are removed from roll 3 by the scraper 30 and thrown back on roll 2 and carried by the latter back to the feed point, while the finer ground material at the center passes on to the receptacle 16. It will be noted that the sides of the housin act to retain this material against latera movement which would tend to throw it oi the ends of the rolls.

Having thus described my invention what I claim as new and desire to protect by LettersPatent of the United States is as follows 1. In a grinding mill comprising a series of rolls adapted to operate in sequence upon the material and including a'delivery roll for the finished product, a pair of devices f spaced apart from one another longitudinally of said delivery roll and including Scrapers disposed substantially `parallel to the axis thereof, the said Scrapers be' adaptedto collect the material. from .the iid portions of said delivery roll for refeeding to the adjacent earlier roll of the sequence. 2.`In a grinding mill comprising a series of rolls adapted to operate in sequence upon the material and including a delivery roll for the finished product, a pair of separated Scrapers arranged adjacent the surface of said delivery roll toward o posite ends thereof, Said Scrapers being isposed substantially parallel to the axis of said delivery roll and adapted to remove the material from the end portions thereof and direct it upon the adjacent earlier roll of the v SeIleS.

v Scrapers arranged adj acentthe surface of said delivery roll toward opposite endsthereof, said Scrapers being dlsposed substantially parallel to the axis of sald delivery roll and adapted to remove the material from the end portions thereof and direct it upon the adj acent earlier roll of the Sequence, and means adjacent said Scrapers preventing movement of the material toward the ends of the roll.

4. In a grinding mill comprising a Series of rolls adapted to operate in Sequence upon the material and including a delivery roll for the finished product, a pair of Separated Scrapers arranged adj acent Said delivery roll toward opposite ends thereof, Said Scrapers having their scraping edges adjacent the meeting line of said delivery roll with the adjacent earlier roll of the sequence.

5. In a grinding mill comprising aser/ies of rolls adapted to operate in sequence upon the material and including a delivery roll for the finished product, a pair of separated Scrapers arranged adjacent said delivery roll toward opposite ends thereof, said Scrapers having their scraping edges adjacent the meeting line of said delivery roll with the adjacent earlier roll of the sequence, and comprising plate-like knives arranged Substantially tangential to the Said delivery roll.-

6. In a grinding mill comprising a series of rolls adapted to operate in sequence upon the material, a pair of separated Scrapers arranged adjacent a later roll of the Sequence toward opposite ends thereof said Scrapers having their scraping edges adjacent the meeting line of the Said roll with the adja cent earlier roll of the sequence, and comprising plate-like knives arranged substantially tangential to the said roll, and means for yieldingly pressing said Scrapers against Said roll.

7. An attachment for a grinding mill comprising a U-Shaped housing having its sides concavely Shaped to fit the converging portions of the 'peripheries of a pair of rolls, and

a scraper carried Wholly Within said housing and adapted to engage one of said rolls adjacent to and parallel With the meeting line of said rolls and direct the material to be ground to the opposite roll.

8. An attachment for a grinding mill comprising a U`-shaped housing having its sides concavely shaped to fit the converging portions of the peripheries of a pair of rolls, and a scraper carried in said housing and adapted to engage one of said rolls, and resilient means pressing said scraper against the said roll.

9. An -attachment for a grinding mill comprising a U-shaped housing shaped to lit the converging portions of the peripheries of a pair o rolls, means for causing said housings to press against said rolls, and a scraper carried Wholly within said housing and adapted to engage one of said rolls and direct the material to he ground to the opposite roll, said scraper being disposed parallel wiltlh and adjacent the meeting line of said ro s.

l0. An attachment for a grinding mill comprising a U-shaped housing shaped to it the convergin portions of the peripheries of apair of ro ls, a scraper carried in said housing and adapted to engage one of said rolls, and means for causing said concaved sides of said housing to press against said rolls, said means including a fixed4V` screw passing freely through an aperture'in said housing, and a nut threaded on said screw and bearing on said housing.

11. An attachment for a grinding mill comprising a scraper, a support in which said scraper is pivotally mounted, a pair of screw-rods swiveled in said support, nuts threaded on said rods, and springs coiled around said rods and bearing between the latter and the scraper.

i l2. An attachment for a grinding mill comprising a scraper, a support in Which said scraper is pivotally mounted, a pair of screw-rods swiveled in said support, nuts threaded on said rods, and springs coiled around said rods and bearing between the latter and the scraper, said nuts having projections engaging in slots in the said support, for lthe purpose set forth.

13. In a grinding mill comprising a series of rolls adapted to operate in sequence upon the material and including a delivery roll for the finished product, a scraper arranged adjacent said delivery roll, toward an end thereof, said scraper being disposed'substantially parallel to the axis o f said delivery roll and adapted to remove the material from the end thereof and direct it upon the adjacent earlier' roll of the sequence.

14. In a grinding mill comprising a series of rolls adapted to operate in sequence upon the material and including a delivery roll for the finished product, a scraper arranged adjacent said delivery roll toward an end thereof, said scraper being disposed substantially parallel to the axis of said delivery roll and adapted to remove the material from the end i 

